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For twin-cam or DOHC engines, VCT was used on either the intake or exhaust camshaft. (Engines that have VCT on both camshafts are now designated as Ti-VCT.↓) The use of variable camshaft timing on the exhaust camshaft is for improved emissions, and vehicles with VCT on the exhaust camshaft do not require exhaust gas recirculation (EGR) as retarding the exhaust cam timing achieves the same ...
Cylinder bore spacing measures 3.937 in (100.0 mm), which is common to all members of the Modular engine family. All Modular V8s, except for the 5.0 L Coyote and 5.2 L Voodoo, utilize the same firing order as the Ford 5.0 L HO and 351 CID V8s (1-3-7-2-6-5-4-8).
The camshaft has three camshaft bearings. A lid made of cast iron covers the camshaft spur gears; the ignition distributor is placed on top of this lid and is driven by the camshaft spur gears. For powering the fuel pump, the camshaft is fitted with an extra cam located in the bearing on the flywheel side. [11]
The camshaft VCT (phaser) design was changed to improve reliability and reduce the development of an engine start-up tapping/rattling noise over time. Ford uses a single piston cooling jet per cylinder, but the oil volume was increased. The underside of the pistons were also redesigned to better transfer heat into the oil.
A cylinder head of a four valve Nissan VQ engine engine. A multi-valve or multivalve engine is one where each cylinder has more than two valves (an intake, and an exhaust).A multi-valve engine has better breathing, and with more smaller valves (having less mass in motion) may be able to operate at higher revolutions per minute (RPM) than a two-valve engine, delivering more power.
During 1992, a high output variant of the 4.0 litre engine, featuring a modified cylinder head and camshaft developed by Tickford Vehicle Engineering, was introduced. [35] Fitted to the sports-oriented Falcon S-XR6 (renamed Falcon XR6 with the updated ED Falcon in 1993) it developed 161 kW (216 hp), only 4 kW (5 hp) less than the optional 5.0 ...
The series launched with a die-cast aluminum engine block, aluminum cylinder heads and magnesium cylinder head covers. [1] All UR engines feature variable valve timing for both intake and exhaust cams or Dual VVT-i. Timing chains are used to drive the camshafts. The UR engine has been produced in 4.6, 5.0, and 5.7-liter displacement versions.
This version featured a reworked cylinder head, solid cam followers and bronze bearings, and a host of other motorsport features. European versions of the carbureted 1.6 L engine from the 1986 model year on were revised and, like the new 1.4 L, benefit from cylinder heads with a heart-shaped lean-burn combustion chambers and a slightly raised ...